These are compatible with Plan B type bipods. Always utilize an alignment rod to confirm the correct setup of the entire system. Ensure all surfaces are clean and the muzzle device is properly torqued and secured with Rockset to the barrel. Be aware that using this on a Q can will void your warranty. Torque the muzzle device to approximately 15 ft-lb - 25 ft-lb, ensuring it is square against the shoulder. When attaching the silencer to the muzzle device, make sure the threads and tapers are clean. Torque the suppressor to 10 ft-lb and verify alignment. The nitride finish contributes to a tighter seal, so it is crucial to properly torque and secure your muzzle device to the barrel with Rockset. 17-4 PH Compatible with Atlas and Atlas XL Compatible with Plan B Black nitride coating with a surface hardness of 67 HRC